The Tesla turbine is also known as disc turbine because the rotor of this turbine is formed by a series of flat, parallel, co-rotating discs, which are closely spaced and attached to a central shaft.2 The working fluid is injected nearly tangentially to the rotor by means of inlet nozzle. The injected fluid, which passes through the narrow gaps between the discs, approaches spirally towards the exhaust port located at the centre of each disc. The viscous drag force, produced due to the relative velocity between the rotor and the working fluid, causes the rotor to rotate. There is a housing surrounding the rotor, with a small radial and axial clearance.